Could you show us the code where $system is populated?

Also, use Devel::Peek to print the internals of some of its values and let us see the output. For instance: 

use Devel::Peek;
...
$system{some_host}{some_user} = $ldap->whatever();
Dump($system{some_host}{some_user});

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In reply to Re^3: Use of freed value in iteration by salva
in thread Use of freed value in iteration by js1

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